#include <bits/stdc++.h>

#include <variant>

#define rep2(i, k, n) for (i64 i = (i64)(k); i < (i64)(n); i++)
#define rep(i, n) rep2(i, 0, n)
#define all(x) begin(x), end(x)
#ifdef ENV_LOCAL
#define dump \
  if (1) cerr
#else
#define dump \
  if (0) cerr
#endif

using namespace std;
using namespace std::string_literals;

using i32 = int32_t;
using i64 = int64_t;
using f64 = double;
using f80 = long double;
using vi32 = vector<i32>;
using vi64 = vector<i64>;

// using namespace harudake;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  i64 l, r, m;
  cin >> l >> r >> m;
  vi64 fact(m);
  fact[0] = 1;
  rep(i, m - 1) fact[i + 1] = fact[i] * (i + 1) % m;
  vi64 prod(m + 1);
  prod[0] = 1;
  rep2(i, 1, m) { prod[i] = prod[i - 1] * fact[i] % m; }
  prod[m] = 0;
  r = min(r, m - 1);
  i64 ans = 0;
  rep2(i, l, r + 1) {
    ans += prod[i];
    ans %= m;
  }
  cout << ans << endl;
  return 0;
}